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+// @flow strict
+import type { PromiseOrValue } from './jsutils/PromiseOrValue';
+import isPromise from './jsutils/isPromise';
+
+import type { Source } from './language/source';
+import { parse } from './language/parser';
+
+import { validate } from './validation/validate';
+
+import type {
+  GraphQLFieldResolver,
+  GraphQLTypeResolver,
+} from './type/definition';
+import type { GraphQLSchema } from './type/schema';
+import { validateSchema } from './type/validate';
+
+import type { ExecutionResult } from './execution/execute';
+import { execute } from './execution/execute';
+
+/**
+ * This is the primary entry point function for fulfilling GraphQL operations
+ * by parsing, validating, and executing a GraphQL document along side a
+ * GraphQL schema.
+ *
+ * More sophisticated GraphQL servers, such as those which persist queries,
+ * may wish to separate the validation and execution phases to a static time
+ * tooling step, and a server runtime step.
+ *
+ * Accepts either an object with named arguments, or individual arguments:
+ *
+ * schema:
+ *    The GraphQL type system to use when validating and executing a query.
+ * source:
+ *    A GraphQL language formatted string representing the requested operation.
+ * rootValue:
+ *    The value provided as the first argument to resolver functions on the top
+ *    level type (e.g. the query object type).
+ * contextValue:
+ *    The context value is provided as an argument to resolver functions after
+ *    field arguments. It is used to pass shared information useful at any point
+ *    during executing this query, for example the currently logged in user and
+ *    connections to databases or other services.
+ * variableValues:
+ *    A mapping of variable name to runtime value to use for all variables
+ *    defined in the requestString.
+ * operationName:
+ *    The name of the operation to use if requestString contains multiple
+ *    possible operations. Can be omitted if requestString contains only
+ *    one operation.
+ * fieldResolver:
+ *    A resolver function to use when one is not provided by the schema.
+ *    If not provided, the default field resolver is used (which looks for a
+ *    value or method on the source value with the field's name).
+ * typeResolver:
+ *    A type resolver function to use when none is provided by the schema.
+ *    If not provided, the default type resolver is used (which looks for a
+ *    `__typename` field or alternatively calls the `isTypeOf` method).
+ */
+export type GraphQLArgs = {|
+  schema: GraphQLSchema,
+  source: string | Source,
+  rootValue?: mixed,
+  contextValue?: mixed,
+  variableValues?: ?{ +[variable: string]: mixed, ... },
+  operationName?: ?string,
+  fieldResolver?: ?GraphQLFieldResolver<any, any>,
+  typeResolver?: ?GraphQLTypeResolver<any, any>,
+|};
+declare function graphql(GraphQLArgs, ..._: []): Promise<ExecutionResult>;
+/* eslint-disable no-redeclare */
+declare function graphql(
+  schema: GraphQLSchema,
+  source: Source | string,
+  rootValue?: mixed,
+  contextValue?: mixed,
+  variableValues?: ?{ +[variable: string]: mixed, ... },
+  operationName?: ?string,
+  fieldResolver?: ?GraphQLFieldResolver<any, any>,
+  typeResolver?: ?GraphQLTypeResolver<any, any>,
+): Promise<ExecutionResult>;
+export function graphql(
+  argsOrSchema,
+  source,
+  rootValue,
+  contextValue,
+  variableValues,
+  operationName,
+  fieldResolver,
+  typeResolver,
+) {
+  /* eslint-enable no-redeclare */
+  // Always return a Promise for a consistent API.
+  return new Promise((resolve) =>
+    resolve(
+      // Extract arguments from object args if provided.
+      arguments.length === 1
+        ? graphqlImpl(argsOrSchema)
+        : graphqlImpl({
+            schema: argsOrSchema,
+            source,
+            rootValue,
+            contextValue,
+            variableValues,
+            operationName,
+            fieldResolver,
+            typeResolver,
+          }),
+    ),
+  );
+}
+
+/**
+ * The graphqlSync function also fulfills GraphQL operations by parsing,
+ * validating, and executing a GraphQL document along side a GraphQL schema.
+ * However, it guarantees to complete synchronously (or throw an error) assuming
+ * that all field resolvers are also synchronous.
+ */
+declare function graphqlSync(GraphQLArgs, ..._: []): ExecutionResult;
+/* eslint-disable no-redeclare */
+declare function graphqlSync(
+  schema: GraphQLSchema,
+  source: Source | string,
+  rootValue?: mixed,
+  contextValue?: mixed,
+  variableValues?: ?{ +[variable: string]: mixed, ... },
+  operationName?: ?string,
+  fieldResolver?: ?GraphQLFieldResolver<any, any>,
+  typeResolver?: ?GraphQLTypeResolver<any, any>,
+): ExecutionResult;
+export function graphqlSync(
+  argsOrSchema,
+  source,
+  rootValue,
+  contextValue,
+  variableValues,
+  operationName,
+  fieldResolver,
+  typeResolver,
+) {
+  /* eslint-enable no-redeclare */
+  // Extract arguments from object args if provided.
+  const result =
+    arguments.length === 1
+      ? graphqlImpl(argsOrSchema)
+      : graphqlImpl({
+          schema: argsOrSchema,
+          source,
+          rootValue,
+          contextValue,
+          variableValues,
+          operationName,
+          fieldResolver,
+          typeResolver,
+        });
+
+  // Assert that the execution was synchronous.
+  if (isPromise(result)) {
+    throw new Error('GraphQL execution failed to complete synchronously.');
+  }
+
+  return result;
+}
+
+function graphqlImpl(args: GraphQLArgs): PromiseOrValue<ExecutionResult> {
+  const {
+    schema,
+    source,
+    rootValue,
+    contextValue,
+    variableValues,
+    operationName,
+    fieldResolver,
+    typeResolver,
+  } = args;
+
+  // Validate Schema
+  const schemaValidationErrors = validateSchema(schema);
+  if (schemaValidationErrors.length > 0) {
+    return { errors: schemaValidationErrors };
+  }
+
+  // Parse
+  let document;
+  try {
+    document = parse(source);
+  } catch (syntaxError) {
+    return { errors: [syntaxError] };
+  }
+
+  // Validate
+  const validationErrors = validate(schema, document);
+  if (validationErrors.length > 0) {
+    return { errors: validationErrors };
+  }
+
+  // Execute
+  return execute({
+    schema,
+    document,
+    rootValue,
+    contextValue,
+    variableValues,
+    operationName,
+    fieldResolver,
+    typeResolver,
+  });
+}